According to IMDB, this should be a 20 minute film, though the copy I found on YouTUbe is only 16 minutes. I strongly suspect it is missing about four minutes...which is often the case with older films on nitrate film stock. There are no intertitles and the story at times seems confusing...especially the first half.
The first half of the story, as I just mentioned, is confusing. It appears as if a new kid (Jackie Condon) movies in and has trouble being accepted by the gang. He not only wants to be there friend but see the tooth they are charging kids to see.
Later, a mugger, Red Mike, attacks someone and the police give chase. Coincidentally, the gang is nearby and think they police are chasing them...so they run. However, Pete the dog springs into action...chasing the crook and eventually subduing him and is a hero. Oddly, soon after this, Sunshine Sammy's dad gives him a whipping for no apparent reason.
My score of 4 is not to say it was originally a bad film. There are some very enjoyable parts (especially involving the dog) but the story is missing too many pieces and is simply confusing at times. Hopefully one day they'll locate a more complete copy and I can re-watch and re-review it.